CRAT STUDY GUIDE QUESTIONS WITH CORRECT
ANSWERS 2025/2026 RATED A+
Normal PRI interval - CORRECT ANSWER --0.12-0.20
Normal QRS interval - CORRECT ANSWER --0.11 or less
What does the P wave represent? - CORRECT ANSWER --Atrial depolarization
What does the QRS complex represent? - CORRECT ANSWER --Atrial repolarization and
ventricular depolarization
Q wave indicates what? - CORRECT ANSWER --Dead myocardial tissue. Always a negative
deflection
What is the natural pacemaker of the heart? - CORRECT ANSWER --SA node
3 types of pacemakers - CORRECT ANSWER --1) single (either RA or RV)
2) dual chamber (RA and LV)
3) bi-ventricular (RV and LV --> Congestive Heart Failure)
Which HB would you NOT need a pacemaker for? - CORRECT ANSWER --First-degree AV block
(prolonged PRI >0.20 seconds)
Define intrinsic beats - CORRECT ANSWER --The patient's own heart beat
What is sensing? - CORRECT ANSWER --The ability for the heart to sense and respond to the
electrical activity of the heart
ANSWERS 2025/2026 RATED A+
Normal PRI interval - CORRECT ANSWER --0.12-0.20
Normal QRS interval - CORRECT ANSWER --0.11 or less
What does the P wave represent? - CORRECT ANSWER --Atrial depolarization
What does the QRS complex represent? - CORRECT ANSWER --Atrial repolarization and
ventricular depolarization
Q wave indicates what? - CORRECT ANSWER --Dead myocardial tissue. Always a negative
deflection
What is the natural pacemaker of the heart? - CORRECT ANSWER --SA node
3 types of pacemakers - CORRECT ANSWER --1) single (either RA or RV)
2) dual chamber (RA and LV)
3) bi-ventricular (RV and LV --> Congestive Heart Failure)
Which HB would you NOT need a pacemaker for? - CORRECT ANSWER --First-degree AV block
(prolonged PRI >0.20 seconds)
Define intrinsic beats - CORRECT ANSWER --The patient's own heart beat
What is sensing? - CORRECT ANSWER --The ability for the heart to sense and respond to the
electrical activity of the heart
